CN103172505A - Method for selectively oxidizing toluene to synthesize benzaldehyde - Google Patents
Method for selectively oxidizing toluene to synthesize benzaldehyde Download PDFInfo
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- CN103172505A CN103172505A CN2013100956010A CN201310095601A CN103172505A CN 103172505 A CN103172505 A CN 103172505A CN 2013100956010 A CN2013100956010 A CN 2013100956010A CN 201310095601 A CN201310095601 A CN 201310095601A CN 103172505 A CN103172505 A CN 103172505A
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Abstract
The invention discloses a method for selectively oxidizing toluene to synthesize benzaldehyde and relates to the field of industrial catalysis of petrochemical industry. Hydrotalcite-like compound (Cox/Al-LDH) and roasted product (Cox/Al-LDO) thereof are adopted as catalysts (x=1-4); acetonitrile, dichloromethane or chloroform is taken as a solvent; and tert-butyl peroxide alcohol is taken as an oxidant, and thus high benzaldehyde selectivity can be obtained. The catalyst is simple to prepare, low in cost, good in stability, and convenient to recover, and can be repeatedly used.
Description
Technical field
The present invention relates to the Industrial Catalysis field of petrochemical complex, relate in particular to the method for selective oxidation toluene synthesizing benzaldehyde under a kind of mild conditions.
Technical background
Phenyl aldehyde is important industrial chemicals, is the important intermediate in fine chemistry industry, is mainly used in the industries such as essence and flavoring agent, medicine, makeup and foodstuff additive.
The synthetic method of phenyl aldehyde has the chlorination toluene hydrolysis method, methyl benzoate reduction method (CN1257060) and toluene catalytic oxidation method etc.Compare with the chlorination toluene hydrolysis method, the phenyl aldehyde that adopts catalytic oxidation to produce, quality product is high, is suitable in sector applications such as medicine, spices, food.Industrial many employing cobalts, manganese, bromine are catalyst system, and acetic acid is reaction solvent, and oxygen or air are oxygen source (CN1296937, CN1522996, EP1088810, US2003187304 and WO9520560 etc.).Under optimal conditions, the transformation efficiency of toluene is 50%, and the selectivity of phenyl aldehyde reaches 60%.The problems such as there is catalyst recovery difficulty in process of production in the method, the acetic acid solvent consumption is large and removal process is complicated and the selectivity of product phenyl aldehyde is lower.Research and development heterogeneous catalytic oxidation technique is significant to the production of phenyl aldehyde, and the research and development of catalyzer remain the key point of dealing with problems.
Patent CA775591, US4137259, CN200910138015.3, CN1068755, CA7726649 and CN101337185 disclose take V and Ag as main active component, with salt or oxide carried mode, catalytic gas phase oxidation toluene prepares the method for phenyl aldehyde, 250 ~ 600 ℃ of temperature of reaction, pressure 0 ~ 10MPa, the transformation efficiency of more excellent condition Toluene is 13%, and selectivity is 54%.CN101791569 discloses a kind of catalyzer that V, Ti is carried on molecular sieve, and under optimal conditions, the transformation efficiency of toluene is 67.1%, and the selectivity of phenyl aldehyde is 78.1%.Patent US4885412 and GB1235724 disclose the solid catalyst take metal M o as main active component, and under the gas-phase reaction condition, the transformation efficiency of toluene reaches 21%, and the selectivity of aldehyde is 76%.Patent US4390728 discloses the oxidation mixture catalyzer of the various metals such as a kind of Cu of containing, Fe, Mo, and under optimal conditions, the transformation efficiency of toluene is 37.8%, and the selectivity of aldehyde is 63.7%, but the preparation process of catalyzer is complicated.Patent CN1485131 discloses the catalyzer of load Zr, and under optimal conditions, the transformation efficiency of toluene is 6.2%, and the selectivity of phenyl aldehyde is 51%.Adopt catalytic oxygen or atmospheric oxidation toluene to prepare the method for phenyl aldehyde, catalyst component and preparation method are comparatively complicated, and temperature of reaction is high, and pressure is larger, have the product that raw material decomposes to produce.
The method of another kind of preparing benzaldehyde by oxidizing toluene is liquid phase method.Patent CN101972646 and CN1827575 disclose take transition metal vanadate or rare-earth vanadate as catalyzer, Glacial acetic acid is reaction solvent, and hydrogen peroxide is oxygenant, the reaction of liquid-phase catalysis toluene oxidation, the transformation efficiency of substrate is 46.8%, and the selectivity of phenyl aldehyde is 80.7%; Patent CN1521153 and CN102070382 disclose the method with μ-oxygen bimetallic porphyrin and monometallic porphyrin catalysis preparing benzaldehyde by oxidizing toluene, the transformation efficiency of toluene is 12%, the overall selectivity of alcohols and aldehydes is 84%, and preparation complexity and the cost of this method catalyzer are higher; CN1631863 discloses take Zr, Co oxide compound as catalyzer, and organic amine is additive, catalysis toluene oxidation reaction under the 1.0MPa Oxygen Condition, and the selectivity of phenyl aldehyde brings up to 85.8%, but in system, the additive such as amine has increased the separating difficulty of product; Patent CN1827575 and CN1824383 disclose the metal oxide catalysts such as V, Mo and Mn, and under more excellent condition, the selectivity of phenyl aldehyde reaches 77%, and productive rate is 13%; Patent CN101786947 discloses take peruscabin as reaction soln, cobaltous benzoate and manganese benzoate are catalyzer, 0.35MPa catalysis toluene oxidation reaction under Oxygen Condition, the transformation efficiency of toluene reaches 52.3%, the selectivity of phenyl aldehyde is 78.3%, but in this method solvent and catalyzer all more expensive.
In addition, the manganese octahedron molecular screen of Au and La modification (CN101940939) and HZSM-5, Na-ZSM-5(CN102503768) also all be used in the reaction of catalysis toluene oxidation, under more excellent condition, the transformation efficiency of toluene is 8.2%, and the selectivity of phenyl aldehyde is 32.5%.
Can find out from published patent, in toluene Heterogeneous oxidation producing benzaldehyde technique, still exist the selectivity of phenyl aldehyde still lower, the shortcomings such as preparation method's complexity of catalyzer and reaction reagent costliness.In view of this, a kind of highly selective catalyzed oxidation toluene producing benzaldehyde technique of the special proposition of this case contriver.
Summary of the invention
The objective of the invention is to disclose the method for high-selectivity oxidation toluene synthesizing benzaldehyde under a kind of mild conditions, overcome deficiency of the prior art.
Liquid-phase catalysis selective oxidation catalyzer provided by the invention is specially the oxide compound that forms after Co/Al houghite or its roasting.
The method of selective catalytic oxidation toluene producing benzaldehyde, carry out according to following step:
The toluene and the solvent that necessarily measure ratio are placed in reaction vessel, add quantitative catalyzer, stir, after being heated to certain temperature of reaction, drip the tertbutyl peroxide that has dewatered in reaction system, the isothermal reaction reaction is after some hours, after reaction finishes, reaction system is down to room temperature, can selective catalytic oxidation toluene producing benzaldehyde.
Wherein said solvent is acetonitrile, methylene dichloride or chloroform;
The volume ratio of wherein said toluene and solvent is 1: 1 ~ 20;
The mol ratio of wherein said toluene and tertbutyl peroxide is 1: 1 ~ 10.
The mass ratio of wherein said catalyzer and toluene is 5 * 10
-3~ 0.2: 1.
Wherein said temperature of reaction is 30 ~ 80 ℃.
The wherein said reaction times is 1 ~ 18 h.
It is characterized in that wherein said catalyzer is Co/Al houghite (Co
x/ Al-LDH) or the oxide compound (Co that forms after its roasting
x/ Al-LDO), x is 1 ~ 4.
It is catalyzer that the present invention adopts the oxide compound that forms after Co/Al houghite or its roasting, selective oxidation toluene synthesizing benzaldehyde under mild conditions has a conversion unit simple, and reproducibility is good, the good selective of phenyl aldehyde is expected to be applied in association area.
Embodiment
The catalyzer that uses in the present invention is Co/Al houghite (Co
x/ Al-LDH) or the oxide compound (Co that forms after its roasting
x/ Al-LDO), x is 1 ~ 4.The synthesized reference document of catalyzer (Gabrovska M, Edreva-Kardjieva, Tenchev K, et al. Appl. Catal. A:Gen., 2011,399:242) method preparation.
Be described in detail the present invention below by embodiment.
Embodiment 1: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 20mL acetonitrile, 50mg Co
2/ Al-LDO catalyzer stirs, and is heated to 70 ℃, drips the TBHP 3.9g that dewaters in reaction system, and the reaction times is 7h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 5.2%, phenyl aldehyde selectivity are 82.6%.
Embodiment 2: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 20mL acetonitrile, 50mg Co
4/ Al-LDO catalyzer stirs, and is heated to 70 ℃, drips the TBHP 3.9g that dewaters in reaction system, and the reaction times is 7h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 7.8%, phenyl aldehyde selectivity are 80.6%.
Embodiment 3: the toluene oxidation reaction is carried out in 100 mL reaction vessels, adds 1g toluene, 20mL acetonitrile, 50mg Co
2/ Al-LDH catalyzer stirs, and is heated to 70 ℃, drips the TBHP 3.9g that dewaters in reaction system, and the reaction times is 7h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 3.4%, phenyl aldehyde selectivity are 86.8%.
Embodiment 4: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 20mL acetonitrile, 50mg Co4/Al-LDH catalyzer, stirs, and is heated to 70 ℃, drips the TBHP 3.9g that dewaters in reaction system, and the reaction times is 7h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 3.9%, phenyl aldehyde selectivity are 85.6%.
Embodiment 5: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 1mL acetonitrile, 50mg Co
4/ Al-LDO catalyzer stirs, and is heated to 70 ℃, drips the TBHP 3.9g that dewaters in reaction system, and the reaction times is 7h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 12.5%, phenyl aldehyde selectivity are 50.6%.
Embodiment 6: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 55mL acetonitrile, 50mg Co
4/ Al-LDO catalyzer stirs, and is heated to 70 ℃, drips TBHP 3.9 g that dewater in reaction system, and the reaction times is 7 h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 4.1%, phenyl aldehyde selectivity are 87.3%.
Embodiment 7: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 20mL acetonitrile, 50mg Co
4/ Al-LDO catalyzer stirs, and is heated to 70 ℃, drips the TBHP 0.98g that dewaters in reaction system, and the reaction times is 7h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 3.2%, phenyl aldehyde selectivity are 86.4%.
Embodiment 8: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 20 mL acetonitriles, 50mg Co
4/ Al-LDO catalyzer stirs, and is heated to 70 ℃, drips the TBHP 9.8g that dewaters in reaction system, and the reaction times is 7h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 11.8%, phenyl aldehyde selectivity are 43.8%.
Embodiment 9: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 20mL acetonitrile, 5mg Co
4/ Al-LDO catalyzer stirs, and is heated to 70 ℃, drips the TBHP 3.9g that dewaters in reaction system, and the reaction times is 7h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 2.8%, phenyl aldehyde selectivity are 83.1%.
Embodiment 10: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 20mL acetonitrile, 200mg Co
4/ Al-LDO catalyzer stirs, and is heated to 70 ℃, drips TBHP 3.9 g that dewater in reaction system, and the reaction times is 7 h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 18.8%, phenyl aldehyde selectivity are 43.6%.
Embodiment 11: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 20mL acetonitrile, 50mg Co
4/ Al-LDO catalyzer stirs, and is heated to 30 ℃, drips the TBHP 3.9g that dewaters in reaction system, and the reaction times is 7h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 2.5%, phenyl aldehyde selectivity are 72.8%.
Embodiment 12: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 20mL acetonitrile, 50mg Co
4/ Al-LDO catalyzer stirs, and is heated to 80 ℃, drips the TBHP 3.9g that dewaters in reaction system, and the reaction times is 7h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 8.2%, phenyl aldehyde selectivity are 76.3%.
Embodiment 13: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 20 mL methylene dichloride, 50mg Co
4/ Al-LDO catalyzer stirs, and is heated to 80 ℃, drips the TBHP 3.9g that dewaters in reaction system, and the reaction times is 1h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 5.4%, phenyl aldehyde selectivity are 76.2%.
Embodiment 14: the toluene oxidation reaction is carried out in the 100mL reaction vessel, adds 1g toluene, 20mL chloroform, 50mg Co
4/ Al-LDO catalyzer stirs, and is heated to 80 ℃, drips TBHP 3.9 g that dewater in reaction system, and the reaction times is 8 h.Reaction is down to room temperature with reaction system, sampling analysis after finishing.Product analysis adopts marker method to complete on the GC-1690 gas chromatograph dawn in section.Toluene conversion 7.6%, phenyl aldehyde selectivity are 78.1%.
Only for content of the present invention is described, in addition, the present invention also has other embodiment to above example.But being equal to, all employings replace or technical scheme that the equivalent deformation mode forms all drops in protection scope of the present invention.
Claims (8)
1. the method for selective catalytic oxidation toluene producing benzaldehyde is characterized in that carrying out according to following step:
The toluene and the solvent that necessarily measure ratio are placed in reaction vessel, add quantitative catalyzer, stir, after being heated to certain temperature of reaction, drip the tertbutyl peroxide that has dewatered in reaction system, the isothermal reaction reaction is after some hours, after reaction finishes, reaction system is down to room temperature, can selective catalytic oxidation toluene producing benzaldehyde.
2. the method for selective catalytic oxidation toluene producing benzaldehyde according to claim 1, is characterized in that wherein said solvent is acetonitrile, methylene dichloride or chloroform.
3. the method for selective catalytic oxidation toluene producing benzaldehyde according to claim 1, the volume ratio that it is characterized in that wherein said toluene and solvent is 1: 1 ~ 20.
4. the method for selective catalytic oxidation toluene producing benzaldehyde according to claim 1, the mol ratio that it is characterized in that wherein said toluene and tertbutyl peroxide is 1: 1 ~ 10.
5. the method for selective catalytic oxidation toluene producing benzaldehyde according to claim 1, the mass ratio that it is characterized in that wherein said catalyzer and toluene is 5 * 10
-3~ 0.2: 1.
6. the method for selective catalytic oxidation toluene producing benzaldehyde according to claim 1, is characterized in that wherein said temperature of reaction is 30 ~ 80 ℃.
7. the method for selective catalytic oxidation toluene producing benzaldehyde according to claim 1, is characterized in that the wherein said reaction times is 1 ~ 18 h.
8. the method for selective catalytic oxidation toluene producing benzaldehyde according to claim 1, is characterized in that wherein said catalyzer is Co/Al houghite Co
xThe oxide compound Co that forms after/Al-LDH or its roasting
x/ Al-LDO, wherein x is 1 ~ 4.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107812523A (en) * | 2017-10-13 | 2018-03-20 | 天津大学 | A kind of Co bases catalyst and preparation method and the application in eugenol conversion |
| CN114854908A (en) * | 2022-04-24 | 2022-08-05 | 陕西科技大学 | Polysaccharide-based nano composite chrome-free tanning agent prepared by using hydrotalcite as catalyst, and method and application thereof |
| CN114920645A (en) * | 2022-05-09 | 2022-08-19 | 常州大学 | Synthetic method of alpha-methoxy methyl acetate derivative |
-
2013
- 2013-03-25 CN CN2013100956010A patent/CN103172505A/en active Pending
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107812523A (en) * | 2017-10-13 | 2018-03-20 | 天津大学 | A kind of Co bases catalyst and preparation method and the application in eugenol conversion |
| CN114854908A (en) * | 2022-04-24 | 2022-08-05 | 陕西科技大学 | Polysaccharide-based nano composite chrome-free tanning agent prepared by using hydrotalcite as catalyst, and method and application thereof |
| CN114854908B (en) * | 2022-04-24 | 2024-01-19 | 陕西科技大学 | Polysaccharide-based nano-composite chromium-free tanning agent prepared by taking hydrotalcite as catalyst, and method and application thereof |
| CN114920645A (en) * | 2022-05-09 | 2022-08-19 | 常州大学 | Synthetic method of alpha-methoxy methyl acetate derivative |
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Application publication date: 20130626 |